from tkinter import *
print ('Введите начальную координату X:')
X = int(input())
print ('Введите начальную координату Y:')
Y = int(input())
print ('Введите коэффицент увеличения N:')
N = int(input())

coords = [0, 0, 10, 0, 10, 10, 20, 10, 20, 20, 0, 20]
if N == 0 and X>=0 and X<=500 and Y>=0 and Y<=500:
    pass
else:
    if N > 0 and 0*N+X>=0 and 0*N+Y>=0 and 20*N+X<=500 and 20*N+Y<=500:
        pass
    else:
        if N < 0 and 20*N+X>=0 and 20*N+Y>=0 and 0*N+X<=500 and 0*N+Y<=500:
            pass
        else:
            print ('Размер фигуры превышает  максимальный размер поля')
            exit()

    root = Tk()
    root.title('Ит марафон')
    root.geometry('500x500')

    canvas = Canvas(bg='white', width=500, height=500)
    canvas.pack(anchor=CENTER, expand=1)

    canvas.create_polygon(coords[0] *N+X, coords [1] *N+Y,
                          coords[2] *N+X, coords [3] *N+Y,
                          coords[4] *N+X, coords [5] *N+Y,
                          coords[6] *N+X, coords [7] *N+Y,
                          coords[8] *N+X, coords [9] *N+Y,
                          coords[10]*N+X, coords [11]*N+Y)

    root.mainloop()
